Introduction to PHOTOGRAPHY A Lecture by Amit Chawla NOTE THIS LINK http //en.wikipedia.org/wiki/Photography
Definition Process of recording images by means of capturing light on a light-sensitive medium, such as a film or electronic sensor during a timed exposure. The process is done through mechanical, chemical or digital devices known as cameras. Traditionally, the product of photography has been called a photograph, commonly shortened to photo.
The word "photography" comes from French word photographie which is based on the Greek φώς (phos) "light" + γραφή (graphê) "stylus", "paintbrush" or "representation by means of lines" or "drawing", together meaning "Drawing With Light."
Photography is considered to be an art form but is closely related to Scientific fields like chemistry & physics.